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                  <p class="p_Heading1"><span class="f_Heading1">Port</span></p>



  
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                <p class="p_TextIndentedL2"><img src="d_port.png" width="123" height="112" border="0" alt="d_Port"></p>
<p class="p_BodyText"><span class="f_BodyText" style="font-style: italic;">Ports</span><span class="f_BodyText"> define the interaction between a classifier and its environment. </span><span class="f_BodyText" style="font-style: italic;">Interfaces</span><span class="f_BodyText"> controlling this interaction can be depicted using the <a href="interface.htm">Interface element</a>. Any connector to a Port must provide the required interface, if defined. Ports can appear on a contained <a href="part.htm">Part</a>, a <a href="class.htm">Class</a>, or the boundary of a <a href="compositeelements.htm">Composite element</a>.</span></p>
<p class="p_BodyText"><span class="f_BodyText">A Port is a</span><span class="f_BodyText" style="font-style: italic;"> typed</span><span class="f_BodyText"> structural feature or property of its containing classifier. Ports are typically <a href="addingaporttoanelement.htm">created</a> in <a href="classdiagram.htm">Class diagrams</a>, <a href="objectdiagram.htm">Object diagrams</a> and <a href="compositestructurediagram.htm">Composite Structure diagrams</a>.</span></p>
<p class="p_BodyText"><span class="f_BodyText">You can <a href="managinginheritedandredefin.htm">expose an inherited Port, or redefine a Port</a>.</span></p>
<p class="p_SubHeadingL1"><span class="f_SubHeadingL1">Toolbox Icon</span></p>
<p class="p_TextIndentedL2"><img src="e_port.png" width="170" height="20" border="0" alt="e_Port"></p>
<p class="p_SubHeadingL1"><span class="f_SubHeadingL1">OMG UML Specification</span></p>
<p class="p_BodyText"><span class="f_BodyText">The OMG UML specification (</span><span class="f_BodyText" style="font-style: italic;">UML Superstructure Specification, v2.1.1, p. 182</span><span class="f_BodyText">) states:</span></p>
<p class="p_OMGText"><span class="f_OMGText">A port is a property of a classifier that specifies a distinct interaction point between that classifier and its environment or between the (behavior of the) classifier and its internal parts. Ports are connected to properties of the classifier by connectors through which requests can be made to invoke the behavioral features of a classifier. A Port may specify the services a classifier provides (offers) to its environment as well as the services that a classifier expects (requires) of its environment.</span></p>




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